We’ve already heard a number of reports of phones running Windows Phone Tango builds currently undergoing testing. Looking at rumors of which future Windows Phone features might arrive when, it’s possible that the platform will finally get LTE support with this release. It doesn’t take too far of a walk to wonder that if there’s already software with support for LTE devices under testing, what about the phones themselves? A new report says that Nokia has just such an LTE handset undergoing evaluation on both AT&T’s and Verizon’s LTE networks.

Though it’s sparse on details, CNET claims to have learned that Nokia is testing a next-generation Windows Phone device on AT&T and Verizon LTE. Considering what we’ve heard about Nokia’s desire to help lead Windows Phone innovation, it’s hardly surprising to see such claims targeting the company and 4G advancements.

CNET does note that just because testing is underway doesn’t mean either carrier has firm plans for this hardware. It refers to the handset as “a 4G LTE version of the Lumia 800″, but it’s unclear if this is just a model created for testing purposes, or if an 800 refresh would eventually introduce just such an LTE radio. It almost seems more likely that we’d see such a feature arrive attached to an all-new device, rather than ride-in on the coattails of established hardware.